Going on a private snorkel cruise is often a great way to see the sights when you're visiting a coastal location. However, there's a lot of variety in snorkel cruises, and no two cruises are exactly the same. As such, it is important that you do not make any assumptions when booking a private snorkel cruise. Read the listing and description closely, and check for these things, in particular.
The word "cruise" often makes people think of a long boat excursion, but actually, most private snorkel cruises are rather short. This is partially because the cruise is private, and the tour guide can dedicate all of their time just to the few passengers on board. Some snorkeling cruises are an hour long. Others are two or three hours long. While there are a few that are longer than this, it's not the norm. Make sure you pay attention to the cruise length before booking. You don't want to assume you're booking a whole-day event when really you'll only be spending 2 hours on the cruise.
If you have snorkeled in the past, this won't be so important. But if you are an inexperienced snorkeler or someone who has never snorkeled, you need to check that instruction is provided. Generally, this instruction is just a few minutes during which your tour guide shows you how to snorkel and goes over safety protocols. It's simple, but it is really important if you don't know how to snorkel. Don't book a cruise without instruction unless you're quite confident in your abilities.
Usually, on a snorkeling cruise, you will get some instruction, climb on the boat, ride to a destination, and then snorkel. Check to see what, exactly, the destination or stopping point is. Try to choose an area that you already wanted to explore or know more about. If the snorkeling cruise has multiple stopping points, take the time to look each one up and learn a little more about it.
You don't need much gear to snorkel. You need goggles, a snorkel, and swimwear. Flippers are nice, but not a necessity. Check what's provided before you book so that you know whether you'll have to pay additional fees to rent equipment that you don't own. Some snorkel companies include all gear in the booking fee, and others charge separately.
If you keep an eye out for the features and options above, you'll be more likely to book a private snorkeling cruise that you really, truly enjoy.